Pipe testing machine



I Sept. 1l, 1934. M. RosENKRANz PIPE TESTING MACHINE Filed April 9. 1952 3 Sheets-Sheet l Sept. 11, 1934. M. RosENKRANz PIPE TESTING MACHINE V inzien/502" Filed April 9, 1932 Sept. 11, 1934. M. ROSENKRANZ PIPE TESTING MACHINE Filed April 9. 1932 3 Sheets-Sheet 3 [Wen-Z072' I /VHX EOSE/VKE/A/Z,

MMM y mf Patented Sept. 11, 1934 UNITED STATES PATENT" orner.

PIPE TESTING MACHINE Max Rosenkranz, Bethel Township, Allegheny` County, Pa., assignor to National Tube Company, a corporation of New Jersey Application April 9, 1932, Serial No. 604,297

3 claims. (ci. 'z3-Q51) This invention relates to machines for .testing pipes by iiuid pressure, one of the objects being to construct a machine of this character which may j be operated very rapidly. Having reference to the accompanying drawings, Which illustrate a specific form of this new machine: f"

Figure 1 is a side elevation.

Figure 2 is a top plan.

Figure 3 is a top plan of a modication. Figure l is a vertical cross-section of a detail from the first two iigures.

Figure 5 is an endy view. M Figure 6 is a cross-section from the line Vi-Vl in Figure l.

Figure 7 is a cross-section from the line `VH--VII in Figure 1.

This machine consists of an elongated frame lwhich has several notched cross members 2 for receiving the pipe to be tested. lts right hand end carries a head 3 which may be moved on Wheels fi and xed in place by a dog 5 which engages a iixed ratchet section 6. This head 3 has a small projecting pipe 7 in its end facing the end of the pipe being tested, and leather washers 8 encircle this pipe. When the pipe under test is pressed against these washers a. seal is established, the testing fluid passing from the pipe into the small pipe 7 through the head 3 and out al conduit 9.

The left hand end of the frame 1 carries a head manifold 10 to which a stationary plunger 411 is fixed. A cylinder 12 dts on the plunger 11 and has a nozzle 13 surrounded by leather washers 14 on its end so as to .register with the end of the pipe being tested. The plunger ll has a. bore forming a conduit communicating with the manifold head 10 and with the inside of the cylinder l2. A baille 15 is arranged inside the cylinder 12 so as to be struck by the fluid coming from the bore in the plunger 11. This plunger is supplied with packing 16 which forms a seal between it and the cylinder.

This cylinder 12 may be manually moved by a lever 1'7 which has an end 18 fitting both sides of a ange 19 thereon. The diameter of the plunger Aand the internal diameter of this cylindergare Asomewhat larger than the internal diameter of the pipe being tested.

When iluid under testing pressure is introduced into the cylinder l2 it will strike thebaiiie 15 and urge the washers 14 against the end of the pipe being tested. The fluid will then enter the pipe through the nozzle 13 and build up a pressure therein but, as the inside diameters of this pipe and of the head l2 are different, different total pressures will result which will hold the cylinder and the Washers tightly against the pipes end.

The testing iiuid is introduced from a suitable source to the manifold head l0 through a valve m 20 which is operated through levers 21 and a con-l necting-rod 22 by an air cylinder 23. The con-g necting-rod'22 is pivoted to rock a bell-crank 24 connected to a lever 25 through a link 26 which is connected to turn a shaft 27 which runs along 65 within the frame 1. This shaft 27 carries a number oi hooks 28 alongy its length which are constructed to engage and hold the pipe being tested on the cross-bars 2 when swung over it. These various connections are made so that the air m cylinder 23 simultaneously opens the valve 20 and rocks the hooks 28 over the pipe. This air cylinder is controlled by a conveniently located valve 29 of the four-Way type, that is, when this valve is thrown in one direction air will be admitted from the top of the cylinder and released from its bottom, while the opposite occurs when the valve is thrown in the other direction.

The drawings illustrate the machine just described for testing single pipes and also one for 30 testing e. plurality of pipes. This latter is exactly similar to the first except that the head 3 on the right hand end of the machine is fixed instead of being movable because the machine in this form is primarily intended for use with pipes which are all substantially the same length.

In using either machine the pipes are placed on the cross-bars 2 and the movable head 12 shoved against their ends by the hand-lever 17. The valve 29 is then operated so that the pipes 90 are held down along' their length by the hooks 28 to prevent their buckling under the stress of the testing pressure and the valve 20 is simultaneously opened -so that the testing uid is admitted to the pipe. This fluid iirst passes through the mov- 95 able head 12 and causes it to tightly compress the pipe between it and the head 3 at the other end of the frame, because of the differential pressures existing within the head 12 and the pipe on test caused by the diilerent sizes of each.

Preferably the pipe 9 of the head 3 communicates with ,a suitable scale chamber 'and with a loo bleeder valve in the conventional manner. After the pipe has been maintained under the testing pressure for the required time the valve 29 is 105 thrown in the opposite direction so that the actions just described are reversed.

Although a specific form of this machine has been shown and described in accordance with the patent statutes, it is not intended to limit plunger projecting from said manifold and opening thereinto, a cylinder fitted on said plunger,

a nozzle and seal arranged onisaid cylinder to register with one end of said pipe, a conduit leading to said head, a valve for said conduit, a

shaft extending under said rack, hooks spaced along said shaft and constructed to .engage and hold said pipe down wheniswung thereover, means including a reciprocating motor and levers arranged to connect said valve'and said shaft to said motor so that the valve opens and the shaft "turns tb pipe engaging position together.

2. A machine for testiing pipes by water pressure including a rack for holding the pipe under test, a manifold at one end ofvsaid rack, a conduit opening intosaid manifold, a bored plunger projecting from said manifold with its bore com-V municating therewith, a cylinder tted on -I said plunger, said cylinder and plunger being arranged so that the former slides toward said pipe, means for sliding said cylinder'on said plunger, a nozzle and a seal arranged on said cylinder to register with one end of said pipe, a baffle iixed in said cylinder to oppose the bore in said plunger, a valve for said conduit, a'shaft 'extending under said rack, hooks spaced along said shaft and constructed to engage and hold said pipe down when swung thereover, and means including a reciprof cating motor and levers, the latter being constructed and arranged to connect said Valve and said shaft to said motor so that the valve opens and the shaft turns said hooks to pipe engaging position together, upon operation of the former.

3. A machine for testing pipes by fluid pressure including a rack for holding the pipe under test, a longitudinally bored plunger fixed adjacent one end of said pipe and alined therewith, a cylinder fitting over said plunger for sliding movement toward said end and with its end provided with a seal and a nozzle means communicating with its interior, a baille iixed in said cylinder across the opening to said nozzle means to oppose the bore in said plunger, and means for conducting uid under pressure to the bore in said plunger.

MAX ROSENKRANZ 

